<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style>
			*{margin: 0;padding: 0;}
			 #wrap{
		        width:500px;
		      	height: 10px;
		      	overflow: hidden;
		        margin:50px auto;
		    }
		</style>
	</head>
	<body>
		<div id="wrap">
	        <img width='100%' src="images/mnls.jpg" alt="">
	    </div>
	    <script>
	    	var oWrap = document.getElementById('wrap');
	    	var height = 0
    		var timer = setInterval(function(){
    			height = Math.min(height,300)
	    		oWrap.style.height = height+'px';
	    		height++;
	    		if (height>300) {
	    			clearInterval(timer);
	    		}
	    	},20)
	    </script>
	</body>
</html>
